Crash.app is a free Android app developed by Spencer Studios that allows you to play a prank on your developer friends by sending them a fake crash message for their app. The app is designed to be simple and easy to use, with a straightforward interface that makes it easy to select the app you want to prank and customize the message that will be displayed.

Once you've selected the app you want to prank, you can choose from a variety of different crash messages to send to your friend. You can also customize the message with your own text, making the prank even more realistic. The app is a fun way to play a harmless joke on your friends, and it's sure to provide a few laughs.